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8th Science U3 L3L4

chemical bond an interaction that holds atoms or ions together
valence electron an electron that is found in the outermost shell of an atom and that determines the atom’s chemical properties
chemical reaction the process in which atoms are rearranged and chemical bonds are broken and formed to produce a chemical change of a substance
chemical formula a combination of chemical symbols and numbers to represent a substance
chemical equation a representation of a chemical reaction that uses symbols to show the relationship between the reactants and the products
reactant a substance that participates in a chemical reaction
product a substance that forms in a chemical reaction
law of conservation of mass the law that states that mass cannot be created or destroyed in ordinary chemical and physical changes
endothermic reaction a chemical reaction that requires energy input, usually as heat
exothermic reaction a chemical reaction in which energy is released to the surroundings, usually as heat
law of conservation of energy the law that states that energy cannot be created or destroyed but can be changed from one form to another
Created by: ashaver